PIK3CA and cancer: Herein, we identified that FOXD1‐AS1 is a cytoplasmic lncRNA in GC and it functions as a ceRNA of PIK3CA through competitive binding to miR‐466, a well‐known tumor suppressor in several cancers (Colden et al., 2017; Liu et al., 2018a; Tong et al., 2019).